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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

506 messages,  Last post on Nov 30, 2009 at 5:21 PM

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What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

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#61 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [opmech] by stoneg Jul 22, 2005 (6:14 am)
Replying to: opmech (Jul 20, 2005 8:37 pm) The brand, Im really not sure. I had it done at a place called Minco in Tallahassee, FL. All they did was change out the torsion bar keys. So far I have looked at the Superchips & Edge, but neither have one for the 05 6.6 Duramax with the LLY (LLY=8th digit in the VIN is a 2) that will recalibrate for larger tire sizes.
#62 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [opmech] by stoneg Jul 22, 2005 (6:18 am)
Replying to: opmech (Jul 20, 2005 8:37 pm) Dave, I did see a leveling kit for an 05 2500HD on ebay for something like $40.00 But it took Minco, something like 2.5-3.0 hours to install it, so in my opion it was $275 WELL spent. Replies to this message: opmech (Jul 22, 2005 7:21 pm)
#63 of 506 Not driving a Yota anymore by stoneg Jul 22, 2005 (6:49 pm)
As of tomorrow I will have had my 05 2500HD Duramax for 2 weeks. Today I had the dealership recalibrate the computer for the 285/75's. The best mileage I have seen was 15.2 MPG on the 5.5 hour drive home from the dealership with the 245/75 doing 82 MPH (give me a break on the speeding thing, Hurricane Dennis was on my 6). I have been getting around 12.5 around town. I am not hauling anything, not even a toolbox (yet), and I am not getting on it (due to the low first gear sucking wind off the line). I am considering a chip or programmer, but am a little nervous about it. With the fuel ecomony and the off the line speed, it sure isnt my old Tacoma V6 anymore! Replies to this message: 05duramax (Jul 24, 2005 5:35 pm) stoneg (Jul 24, 2005 5:50 pm) rogueservices (Sep 06, 2005 1:27 pm) stoneg (Sep 11, 2005 2:06 pm)
#64 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [stoneg] by opmech Jul 22, 2005 (7:21 pm)
Replying to: stoneg (Jul 22, 2005 6:18 am) Stone,   Thanks again, I will look for the kit on ebay. Also, give Roland Trudell a call at 951-272-9090. He owns Rolling Big Power, a Diesel performance aftermarket parts dealer. Tell him that his AMSOIL Dealer, David Daniels referred you to him and that I said he would take care of you. I use the RBP programer and it does have the tire size issue taken care of along with some other goodies. I am very happy with the one he sent me.   Dave
#65 of 506 Re: What's involved in recalibrating? by 05duramax Jul 24, 2005 (5:35 pm)
Replying to: stoneg (Jul 22, 2005 6:49 pm) I would like to know if all dealers can do this (recalibrate for different tire size) as the standard 245s are pretty lame looking. Can you get the 285s in blackwall? I'm not a big fan of raised white letters. Sure, I know you can turn them around, but are there any true blackwalls in that size/load capacity? Now have over 2,500 miles on my 2005 2500 HD with Duramax and it's a great truck, overall, save for the look of the tires. Been a Ford man most of my life, but this Chevy is an extremely good truck. I saw an 06 Ford F-250 SuperDuty today with their 20" rims/tires and it looks very, very good. Don't need to have 20's on my Chevy, just something that fills the wheel wells better than the pizza cutters that came on it. Replies to this message: stoneg (Jul 24, 2005 5:50 pm)
#66 of 506 Re: What's involved in recalibrating? [05duramax] by stoneg Jul 24, 2005 (5:50 pm)
Replying to: 05duramax (Jul 24, 2005 5:35 pm) I have read that dealerships are charging around $100 to recalibrate for larger tires sizes. My local dealership did not charge me a penny. Some of the performance programmers claim to be able to recalibrate, but none that I have researched will do the LLY motor (LLY= 8th VIN # digit is a 2) for some reason. I went the 285/75/16 load range "D" in the BF Goodrich All Terrain TA ko with the raised white letter out (my truck is white) so it looks good to me. I had to due some very minor trimming to the front valence to keep from rubbing, but I probably could have gone 295 or 305 after the trim. I have had a leveling kit installed prior to the new tires (raised the front up 2 1/2 inches to bring it to same height as the back). I saw an 05 F250 Diesel King Ranch with the same kind of tires as mine on 22" at the Ford Dealership here in Tallahassee, FL (It did look awesome) You can always put larger tires/rims on the F250 than the 2500 due to the wheel wells being more rounded than squared as the GMC/Chevy's are.
#67 of 506 blackwall tires by roughneck Jul 25, 2005 (5:09 pm)
05duramax        I am sure there must a tire out there that size that is a blackwall only. The load range might be a different story. If you don't put a heavy load on the D range will work. All the tires I saw had the D range in the 285's at the tire shop. But if your like me you might not find a tread pattern that you like and blackwall. I have a 04 chevy duramax crew cab long bed and just put 285's on it. Cooper STT(white outlined). They have a pretty aggressive tread pattern, a little noisy. I had to lift the torsion bars 1", front end alignment, shaved a hair off the front valance and some cutting of the driver side inner fender well. I still have a little rub on the back of the fender well. The only reason that still rubs is the parking brake cable makes the fender well stick out just enough to rub at full crank of the wheel. I'm real happy with how the truck looks now. I had the pizza cutters before too. But a word of advise that all tire shops might not tell you. The stock 6.5" wide rims are not recommended. It can cause uneven tire wear and all other kinds of problems. You should get at least an 8" rim or so. They'll mount up on you stock rims but I wouldn't do it. Your just asking for problems down the road. Also I haven't recalibrated my speedo yet I'm going to get a programmer for that I still have the LB7 motor plus get some more power, I can already tell the difference in fuel mileage already. I would have to guess I'm getting about 16mpg. Before I was getting around 19mpg. A guy at work put 305's on his 02 duramax and had to do some more trimming on the valence and just a hair on the bumper along with what I did, and it looks real good too. Replies to this message: 05duramax (Jul 26, 2005 12:47 pm)
#68 of 506 Re: Love my 2003 DM 2500 HD 4x4 Crew Cab [opmech] by pescador Jul 26, 2005 (11:39 am)
Replying to: opmech (Jul 20, 2005 8:37 pm) Dave:   I would be interested in the programmer you mentioned as well. Mine is a 2004 Duramax LLY engine.   Pescador
#69 of 506 Re: blackwall tires [roughneck] by 05duramax Jul 26, 2005 (12:47 pm)
Replying to: roughneck (Jul 25, 2005 5:09 pm) Thanks to you and the others for advice on this. Most appreciated.   05duramax

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